Add optional smart resolve sulotion

The smart resolvaion can guess most symbols but it might be slow so disabled by default users can turn on it in the editor setting

modules/gdscript/language_server/gdscript_language_protocol.cpp

@@ -32,6 +32,7 @@
 #include "core/io/json.h"
 #include "core/os/copymem.h"
 #include "core/project_settings.h"
+#include "editor/editor_node.h"
 
 GDScriptLanguageProtocol *GDScriptLanguageProtocol::singleton = NULL;
 
@@ -159,6 +160,10 @@ void GDScriptLanguageProtocol::notify_client(const String &p_method, const Varia
 	(*peer)->put_packet((const uint8_t *)charstr.ptr(), charstr.length());
 }
 
+bool GDScriptLanguageProtocol::is_smart_resolve_enabled() const {
+	return bool(_EDITOR_GET("network/language_server/enable_smart_resolve"));
+}
+
 GDScriptLanguageProtocol::GDScriptLanguageProtocol() {
 	server = NULL;
 	singleton = this;